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Fashion norms have changed greatly between decades. The United States of America has generally followed, and in some cases led, trends in the history of Western fashion. It has some unique regional clothing styles, such as western wear.

Blue jeans were popularized as work clothes in the 1850's by Levi Strauss, an American merchant of German origin in San Francisco, and were adopted by many American teenagers a century later. They are now widely worn on every continent by people of all ages and social classes. Along with mass-marketed informal wear in general, blue jeans are perhaps American culture's primary contribution to global fashion.[1] Other fashion trends started in the US include sports wear as fashion along with athletic shoe wear like Converse or Nike . Atheleisure was also popularized in the US around 2012, and as of 2017 the trend has all but dominated the US market. Athleisure has dominated the US market because of its ability to fill a gap in the market, as clothing wasn't usually both comfortable, stylish, and functional. https://www.forbes.com/sites/greatspeculations/2016/10/06/the-athleisure-trend-is-here-to-stay/#266c8cf728bd

Dress norms in the United States are generally consistent with those of other post-industrial Western nations, and have become largely informal since the mid-20th century. Clothing in the United States also depends on a variety of factors including location, venue, and demographic factors such as ethnicity. Jeans are a consistent fashion trend among all classes, with variations being vast in both price and style.

The western states are commonly noted for being more informal in their manner of dress than those closer to the eastern seaboard. Conspicuous consumption and a desire for quality have also led to a strong preference for designer label clothing among many in the middle and upper classes.

The tolerance of body expression that deviates from the mainstream, such as complete body tattoos or nudism, is strongly linked to the sub-culture and location in which an individual may find him or herself. Generally, the United States tends to be less tolerant towards nudity than Western Europe, even in more tolerant areas such as California. The tolerance shown for personal expression such as cross-dressing and piercings varies greatly with location and sub-culture, and may be completely appropriate in one venue while being taboo in another.[3]